The National Trust is warning dog walkers to be vigilant after the sudden death of two pet Chihuahuas following a visit to one of the organisation's properties.

Sarah Macdonald lost Bono and Jet when they fell ill not long after a walk around a National Trust site.

The mum is devastated at their deaths and is convinced the only place they could have fallen ill was at Saltram in Devon.

After taking her three dogs for a walk at Saltram on Friday night, two of them quickly became ill, Plymouth Live reported .

Sarah is unsure of what has happened to her Chihuahuas, and doesn’t wish to lay blame on Saltram and the National Trust – but the mum said it was the only place aside from their Crownhill home where the dogs had been since becoming fatally ill.

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Jet the dog had to be put down after a walk at a National Trust site in Devon

The 45-year-old said she has received messages from people saying anti-freeze may have contaminated water in the area.

She added that other dog walkers have been in touch saying their pets have fallen ill after walks at the park.

The National Trust, which runs Saltram House and its grounds, has asked visitors to be extra vigilant and report anything to them as soon as possible.

It added that there had been no evidence of anti-freeze at the park.

Jet the dog had to be put down after a walk at a National Trust site in Devon

Sarah left the house with her three dogs Bleu, Jet and Bono on Friday night to go for a walk around Saltram. They took the path that goes along the Embankment before heading home.

On Saturday night Sarah’s son found bile-like sick on the sofa. On Sunday, Bono was getting increasingly worse, with Sarah saying her cherished Chihuahua looked “scared”.

Bono was rushed to the vets on Sunday night but during the early hours of Monday morning he had passed away.

Sarah said the vet had told her Bono may have had sepsis, but she didn’t leave her pet there to have definitive blood tests after his death.

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